Signal device



FIG. 1 is a side, top perspective view of a signal device showing our new design;

FIG. 2, is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational thereof;

FIG. 6 is a top elevation view thereof; and,

FIG. 7 is a bottom elevation view thereof.

The elements shown in phantom form no part of the claim design. 

CLAIM The ornamental design for a signal device, as shown and described. 